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- What's New
- Function Overview
- Product Bulletin
-
Service Overview
- Infographics
- What Is DMS for Kafka?
- Product Advantages
- Application Scenarios
- Kafka Instance Specifications
- Comparing Single-node and Cluster Kafka Instances
- Comparing Kafka, RabbitMQ, and RocketMQ
- Comparing DMS for Kafka and Open-Source Kafka
- Security
- Notes and Constraints
- Related Services
- Basic Concepts
- Permissions
- Billing
- Getting Started
-
User Guide
- Process of Using Kafka
- Permissions Management
- Buying a Kafka Instance
- Configuring Topics
- Connecting to an Instance
- Managing Messages
- Managing Consumer Groups
- Managing Quotas
-
Managing Instances
- Viewing and Modifying Basic Information of a Kafka Instance
- Viewing Kafka Disk Usage
- Viewing Kafka Background Tasks
- Viewing Sample Code of Kafka Production and Consumption
- Modifying Kafka Instance Configuration Parameters
- Configuring Kafka Instance Tags
- Configuring Kafka Recycling Policies
- Upgrading the Kafka Instance Kernel
- Exporting the Kafka Instance List
- Restarting a Kafka Instance
- Deleting Kafka Instances
- Using Kafka Manager
- Modifying Kafka Instance Specifications
- Migrating Data
- Testing Instance Performance
- Applying for Increasing Kafka Quotas
- Monitoring and Alarms
- Viewing Kafka Audit Logs
-
Best Practices
- Kafka Best Practices
- Improving Kafka Message Processing Efficiency
- Optimizing Consumer Polling
- Interconnecting Logstash to Kafka to Produce and Consume Messages
- Using MirrorMaker to Synchronize Data Across Clusters
- Handling Message Accumulation
- Handling Service Overload
- Handling Uneven Service Data
- Configuring Message Accumulation Monitoring
- Suggestions on Using DMS for Kafka Securely
- Developer Guide
-
API Reference
- Before You Start
- API Overview
- Calling APIs
- Getting Started
-
APIs V2 (Recommended)
- Managing Lifecycle
-
Instance Management
- Resetting the Password
- Resetting Kafka Manager Password
- Restarting Kafka Manager
- Configuring Automatic Topic Creation
- Modifying the Private IP Address for Cross-VPC Access
- Querying Kafka Cluster Metadata
- Querying Coordinator Details of a Kafka Instance
- Reassigning Replicas of a Topic for a Kafka Instance
- Modifying Kafka Access Modes
- Querying the Disk Usage Status of Topics
- Initiating Partition Reassigning for a Kafka Instance
- Disabling Kafka Manager
- Deleting a User or Client Quota
- Querying User or Client Quotas
- Creating User or Client Quotas
- Modifying User or Client Quotas
-
Smart Connect
- Enabling Smart Connect (Pay-per-Use Instance)
- Disabling Smart Connect (Pay-per-Use Instance)
- Creating a Smart Connect Task
- Querying Smart Connect Tasks
- Querying Smart Connect Task Details
- Deleting a Smart Connect Task
- Pausing a Smart Connect Task
- Restarting a Smart Connect Task
- Starting a Smart Connect Task or Restarting a Paused or Running Smart Connect Task
- Specification Modification Management
- Topic Management
-
Managing Consumer Groups
- Querying Consumer Group Details
- Querying All Consumer Groups
- Deleting Consumer Groups of a Kafka Instance in Batches
- Creating a Consumer Group
- Resetting Consumer Group Offset to the Specified Position
- Querying the Offset of a Consumer Group
- Modifying All Consumer Groups
- Querying a Specified Consumer Group
- Deleting a Specified Consumer Group
- Modifying a Specified Consumer Group
- Querying Topics of a Specified Consumer Group
- Querying Consumers in a Specified Consumer Group
- User Management
- Managing Messages
- Background Task Management
- Tag Management
- Diagnosis Management
- Other APIs
- Permissions and Supported Actions
- Out-of-Date APIs
- Appendix
- Change History
- SDK Reference
-
FAQs
-
Instances
- Why Can't I Select Two AZs?
- Why Can't I View the Subnet and Security Group Information When Creating a DMS Instance?
- How Do I Select Storage Space for a Kafka Instance?
- How Do I Choose Between High I/O and Ultra-high I/O?
- Which Capacity Threshold Policy Should I Use?
- Which Kafka Versions Are Supported?
- What Is the ZooKeeper Address of a Kafka Instance?
- Are Kafka Instances in Cluster Mode?
- Can I Modify the Port for Accessing a Kafka Instance?
- How Long Are Kafka SSL Certificates Valid for?
- How Do I Synchronize Data from One Kafka Instance to Another?
- How Do I Change the SASL_SSL Setting of a Kafka Instance?
- How Do I Modify the SASL Mechanism?
- How Do I Change the Security Protocol?
- Will a Kafka Instance Be Restarted After Its Enterprise Project Is Modified?
- Are Kafka Brokers and ZooKeeper Deployed on the Same VM or on Different VMs?
- Can I Delete a Kafka Instance Billed in Yearly/Monthly Mode?
- Which Cipher Suites Are Supported by Kafka?
- Can I Change Single-AZ Deployment to Multi-AZ Deployment for an Instance?
- Does DMS for Kafka Support Cross-AZ Disaster Recovery? Where Can I Check Whether an Existing Instance is Across-AZs?
- Do Kafka Instances Support Disk Encryption?
- Can I Change the VPC and Subnet After a Kafka Instance Is Created?
- Where Can I Find Kafka Streams Use Cases?
- Can I Upgrade Kafka Instances?
- How Do I Bind an EIP Again?
- Specification Modification
-
Connections
- How Do I Select and Configure a Security Group?
- Can I Access a Kafka Instance Over a Public Network?
- How Many Connection Addresses Does a Kafka Instance Have by Default?
- Do Kafka Instances Support Cross-Region Access?
- Do Kafka Instances Support Cross-VPC Access?
- Do Kafka Instances Support Cross-Subnet Access?
- Does DMS for Kafka Support Authentication with Kerberos?
- Does DMS for Kafka Support Password-Free Access?
- How Do I Obtain the Public Access Address After Public Access Is Enabled?
- Does DMS for Kafka Support Authentication on Clients by the Server?
- Can I Use PEM SSL Truststore When Connecting to a Kafka Instance with SASL_SSL Enabled?
- What Are the Differences Between JKS and CRT Certificates?
- Which TLS Version Does DMS for Kafka Support?
- Is There a Limit on the Number of Client Connections to a Kafka Instance?
- How Many Connections Are Allowed from Each IP Address?
- Can I Change the Private Network Addresses of a Kafka Instance?
- Is the Same SSL Certificate Used for Different Instances?
- Why Is It Not Recommended to Use a Sarama Client for Messaging?
-
Topics and Partitions
- Is There a Limit on the Number of Topics in a Kafka Instance?
- Why Is Partition Quantity Limited?
- Can I Reduce the Partition Quantity?
- Why Do I Fail to Create Topics?
- Do Kafka Instances Support Batch Importing Topics or Automatic Topic Creation?
- Why Do Deleted Topics Still Exist?
- Can I View the Disk Space Used by a Topic?
- Can I Add ACL Permissions for Topics?
- What Should I Do If Kafka Storage Space Is Used Up Because Retrieved Messages Are Not Deleted?
- How Do I Increase the Partition Quantity?
- Will a Kafka Instance Be Restarted After Its Automatic Topic Creation Setting Is Modified?
- What Can I Do If a Consumer Fails to Retrieve Messages from a Topic Due to Insufficient Permissions?
-
Consumer Groups
- Do I Need to Create Consumer Groups, Producers, and Consumers for Kafka Instances?
- Will a Consumer Group Without Active Consumers Be Automatically Deleted in 14 Days?
- Why Does a Deleted Consumer Group Still Exist?
- Why Can't I View Consumers When Instance Consumption Is Normal?
- Can I Delete Unnecessary Topics in a Consumer Group?
-
Messages
- What Is the Maximum Size of a Message that Can be Created?
- Why Does Message Poll Often Fail During Rebalancing?
- Why Can't I Query Messages on the Console?
- What Can I Do If Kafka Messages Are Accumulated?
- Why Do Messages Still Exist After the Retention Period Elapses?
- Do Kafka Instances Support Delayed Message Delivery?
- How Do I View the Number of Accumulated Messages?
- Why Is the Message Creation Time Displayed as Year 1970?
- How Do I Modify message.max.bytes?
- Why Are Offsets Not Continuous?
-
Kafka Manager
- Can I Configure a Kafka Manager Account to Be Read-Only?
- Why Can't I See Broker Information After Logging In to Kafka Manager?
- Yikes! Insufficient partition balance when creating topic : projectman_project_enterprise_project Try again.
- Can I Query the Body of a Message by Using Kafka Manager?
- Can I Change the Port of the Kafka Manager Web UI?
- Which Topic Configurations Can Be Modified on Kafka Manager?
- Why Is Information Displayed on Kafka Manager Inconsistent with Cloud Eye Monitoring Data?
- How Do I Change a Partition Leader for a Topic in Kafka Manager?
- Why Is the Version on the Console Different from That in Kafka Manager?
- Why Does an Instance Contain Default Topics __trace and __consumer_offsets?
- Why Do I See a Deleted Consumer Group on Kafka Manager?
-
Monitoring & Alarm
- Why Can't I View the Monitoring Data?
- Why Is the Monitored Number of Accumulated Messages Inconsistent with the Message Quantity Displayed on the Kafka Console?
- Why Is a Consumer Group Still on the Monitoring Page After Being Deleted?
- Why Do Metrics Fluctuate Significantly (Disk Read/Write Speed, Average Disk Read/Write Time, and CPU Usage)?
- Why Does JVM Heap Memory Usage of JVM Fluctuate Significantly?
- Why Is Production Rate Still 0 When There Are Produced Messages?
-
Instances
-
Troubleshooting
- Troubleshooting Kafka Connection Exceptions
- Troubleshooting 6-Min Latency Between Message Creation and Retrieval
- Troubleshooting Message Creation Failures
- Troubleshooting Topic Deletion Failures
- Troubleshooting Failure to Log In to Kafka Manager in Windows
- Troubleshooting Error "Topic {{topic_name}} not present in metadata after 60000 ms" During Message Production or Consumption
- Flink 1.15 Consumption Progress Submission Failure
- Videos
-
More Documents
-
User Guide (ME-Abu Dhabi Region)
- Service Overview
- Getting Started
- Permissions Management
- Preparing Required Resources
- Buying an Instance
- Accessing a Kafka Instance
- Managing Instances
- Managing Topics
- Managing Messages
- Managing Users
- Managing Consumer Groups
- Managing Kafka Quotas
- Modifying Kafka Parameters
- Quotas
- Monitoring
- Auditing
-
FAQs
-
Instances
- Why Can't I Select Two AZs?
- Why Can't I View the Subnet and Security Group Information When Creating a DMS Instance?
- How Do I Select Storage Space for a Kafka Instance?
- How Do I Choose Between High I/O and Ultra-high I/O?
- Which Capacity Threshold Policy Should I Use?
- Which Kafka Versions Are Supported?
- What Is the ZooKeeper Address of a Kafka Instance?
- Are Kafka Instances in Cluster Mode?
- Can I Modify the Port for Accessing a Kafka Instance?
- How Long Are Kafka SSL Certificates Valid for?
- How Do I Synchronize Data from One Kafka Instance to Another?
- How Do I Change the SASL_SSL Setting of a Kafka Instance?
- How Do I Modify the SASL Mechanism?
- Will a Kafka Instance Be Restarted After Its Enterprise Project Is Modified?
- Are Kafka Brokers and ZooKeeper Deployed on the Same VM or on Different VMs?
- Which Cipher Suites Are Supported by Kafka?
- Can I Change an Instance from Single-AZ Deployment to Multi-AZ Deployment?
- Does DMS for Kafka Support Cross-AZ Disaster Recovery? Where Can I View the AZs Configured for an Existing Instance?
- Do Kafka Instances Support Disk Encryption?
- Does Specification Modification Affect Services?
- Can I Change the VPC and Subnet After a Kafka Instance Is Created?
- Where Can I Find Kafka Streams Use Cases?
- Can I Upgrade Kafka Instances?
- Why Is the Version on the Console Different from That in Kafka Manager?
- How Do I Bind an EIP Again?
-
Connections
- How Do I Select and Configure a Security Group?
- Can I Access a Kafka Instance Over a Public Network?
- How Many Connection Addresses Does a Kafka Instance Have by Default?
- Do Kafka Instances Support Cross-Region Access?
- Do Kafka Instances Support Cross-VPC Access?
- Do Kafka Instances Support Cross-Subnet Access?
- Does DMS for Kafka Support Authentication with Kerberos?
- Does DMS for Kafka Support Password-Free Access?
- How Do I Obtain the Public Access Address After Public Access Is Enabled?
- Does DMS for Kafka Support Authentication on Clients by the Server?
- Can I Use PEM SSL Truststore When Connecting to a Kafka Instance with SASL_SSL Enabled?
- What Are the Differences Between JKS and CRT Certificates?
- Which TLS Version Does DMS for Kafka Support?
- Is There a Limit on the Number of Client Connections to a Kafka Instance?
- How Many Connections Are Allowed from Each IP Address?
- Can I Change the Private Network Addresses of a Kafka Instance?
- Is the Same SSL Certificate Used for Different Instances?
-
Topics and Partitions
- Is There a Limit on the Number of Topics in a Kafka Instance?
- Why Is Partition Quantity Limited?
- Can I Change the Partition Quantity?
- Why Do I Fail to Create Topics?
- Do Kafka Instances Support Batch Importing Topics or Automatic Topic Creation?
- Why Do Deleted Topics Still Exist?
- Can I View the Disk Space Used by a Topic?
- Can I Add ACL Permissions for Topics?
- What Should I Do If Kafka Storage Space Is Used Up Because Retrieved Messages Are Not Deleted?
- How Do I Increase the Partition Quantity?
- Will a Kafka Instance Be Restarted After Its Automatic Topic Creation Setting Is Modified?
- How Do I Disable Automatic Topic Creation?
- Can I Delete Unnecessary Topics in a Consumer Group?
- What Can I Do If a Consumer Fails to Retrieve Messages from a Topic Due to Insufficient Permissions?
- Why Does an Instance Contain Default Topics __trace and __consumer_offsets?
- Consumer Groups
-
Messages
- What Is the Maximum Size of a Message that Can be Created?
- Why Does Message Poll Often Fail During Rebalancing?
- Why Can't I Query Messages on the Console?
- What Can I Do If Kafka Messages Are Accumulated?
- Why Do Messages Still Exist After the Retention Period Elapses?
- Do Kafka Instances Support Delayed Message Delivery?
- How Do I View the Number of Accumulated Messages?
- Why Is the Message Creation Time Displayed as Year 1970?
-
Kafka Manager
- Can I Configure a Kafka Manager Account to Be Read-Only?
- Why Can't I See Broker Information After Logging In to Kafka Manager?
- Yikes! Insufficient partition balance when creating topic : projectman_project_enterprise_project Try again.
- Can I Query the Body of a Message by Using Kafka Manager?
- Can I Change the Port of the Kafka Manager Web UI?
- Which Topic Configurations Can Be Modified on Kafka Manager?
- Why Is Information Displayed on Kafka Manager Inconsistent with Cloud Eye Monitoring Data?
- How Do I Change a Partition Leader for a Topic in Kafka Manager?
- Monitoring & Alarm
-
Instances
-
Troubleshooting
- Troubleshooting Kafka Connection Exceptions
- Troubleshooting 6-Min Latency Between Message Creation and Retrieval
- Troubleshooting Message Creation Failures
- Troubleshooting Topic Deletion Failures
- Troubleshooting Failure to Log In to Kafka Manager in Windows
- Troubleshooting Error "Topic {{topic_name}} not present in metadata after 60000 ms" During Message Production or Consumption
- Change History
- API Reference (ME-Abu Dhabi Region)
-
User Guide (Paris Region)
- Service Overview
- Getting Started
- Permissions Management
- Preparing Required Resources
- Creating an Instance
- Accessing a Kafka Instance
- Managing Instances
- Managing Topics
- Managing Messages
- Managing Users
- Managing Consumer Groups
- Managing Kafka Quotas
- Modifying Kafka Parameters
- Quotas
- Monitoring
- Auditing
-
FAQs
-
Instances
- Why Can't I Select Two AZs?
- Why Can't I View the Subnet and Security Group Information When Creating a DMS Instance?
- How Do I Select Storage Space for a Kafka Instance?
- How Do I Choose Between High I/O and Ultra-high I/O?
- Which Capacity Threshold Policy Should I Use?
- Which Kafka Versions Are Supported?
- What Is the ZooKeeper Address of a Kafka Instance?
- Are Kafka Instances in Cluster Mode?
- Can I Modify the Port for Accessing a Kafka Instance?
- How Long Are Kafka SSL Certificates Valid for?
- How Do I Synchronize Data from One Kafka Instance to Another?
- How Do I Change the SASL_SSL Setting of a Kafka Instance?
- How Do I Modify the SASL Mechanism?
- Will a Kafka Instance Be Restarted After Its Enterprise Project Is Modified?
- Are Kafka Brokers and ZooKeeper Deployed on the Same VM or on Different VMs?
- Which Cipher Suites Are Supported by Kafka?
- Can I Change an Instance from Single-AZ Deployment to Multi-AZ Deployment?
- Does DMS for Kafka Support Cross-AZ Disaster Recovery? Where Can I View the AZs Configured for an Existing Instance?
- Do Kafka Instances Support Disk Encryption?
- Can I Change the VPC and Subnet After a Kafka Instance Is Created?
- Where Can I Find Kafka Streams Use Cases?
- Can I Upgrade Kafka Instances?
- Why Is the Version on the Console Different from That in Kafka Manager?
- How Do I Bind an EIP Again?
- Specification Modification
-
Connections
- How Do I Select and Configure a Security Group?
- Can I Access a Kafka Instance Over a Public Network?
- How Many Connection Addresses Does a Kafka Instance Have by Default?
- Do Kafka Instances Support Cross-Region Access?
- Do Kafka Instances Support Cross-VPC Access?
- Do Kafka Instances Support Cross-Subnet Access?
- Does DMS for Kafka Support Authentication with Kerberos?
- Does DMS for Kafka Support Password-Free Access?
- How Do I Obtain the Public Access Address After Public Access Is Enabled?
- Does DMS for Kafka Support Authentication on Clients by the Server?
- Can I Use PEM SSL Truststore When Connecting to a Kafka Instance with SASL_SSL Enabled?
- What Are the Differences Between JKS and CRT Certificates?
- Which TLS Version Does DMS for Kafka Support?
- Is There a Limit on the Number of Client Connections to a Kafka Instance?
- How Many Connections Are Allowed from Each IP Address?
- Can I Change the Private Network Addresses of a Kafka Instance?
- Is the Same SSL Certificate Used for Different Instances?
- Why Is It Not Recommended to Use a Sarama Client for Messaging?
-
Topics and Partitions
- Is There a Limit on the Number of Topics in a Kafka Instance?
- Why Is Partition Quantity Limited?
- Can I Reduce the Partition Quantity?
- Why Do I Fail to Create Topics?
- Do Kafka Instances Support Batch Importing Topics or Automatic Topic Creation?
- Why Do Deleted Topics Still Exist?
- Can I View the Disk Space Used by a Topic?
- Can I Add ACL Permissions for Topics?
- What Should I Do If Kafka Storage Space Is Used Up Because Retrieved Messages Are Not Deleted?
- How Do I Increase the Partition Quantity?
- Will a Kafka Instance Be Restarted After Its Automatic Topic Creation Setting Is Modified?
- How Do I Disable Automatic Topic Creation?
- Can I Delete Unnecessary Topics in a Consumer Group?
- What Can I Do If a Consumer Fails to Retrieve Messages from a Topic Due to Insufficient Permissions?
- Why Does an Instance Contain Default Topics __trace and __consumer_offsets?
- Consumer Groups
-
Messages
- What Is the Maximum Size of a Message that Can be Created?
- Why Does Message Poll Often Fail During Rebalancing?
- Why Can't I Query Messages on the Console?
- What Can I Do If Kafka Messages Are Accumulated?
- Why Do Messages Still Exist After the Retention Period Elapses?
- Do Kafka Instances Support Delayed Message Delivery?
- How Do I View the Number of Accumulated Messages?
- Why Is the Message Creation Time Displayed as Year 1970?
-
Kafka Manager
- Can I Configure a Kafka Manager Account to Be Read-Only?
- Why Can't I See Broker Information After Logging In to Kafka Manager?
- Yikes! Insufficient partition balance when creating topic : projectman_project_enterprise_project Try again.
- Can I Query the Body of a Message by Using Kafka Manager?
- Can I Change the Port of the Kafka Manager Web UI?
- Which Topic Configurations Can Be Modified on Kafka Manager?
- How Do I Change a Partition Leader for a Topic in Kafka Manager?
- Monitoring & Alarm
-
Instances
-
Troubleshooting
- Troubleshooting Kafka Connection Exceptions
- Troubleshooting 6-Min Latency Between Message Creation and Retrieval
- Troubleshooting Message Creation Failures
- Troubleshooting Topic Deletion Failures
- Troubleshooting Failure to Log In to Kafka Manager in Windows
- Troubleshooting Error "Topic {{topic_name}} not present in metadata after 60000 ms" During Message Production or Consumption
- Change History
-
API Reference (Paris Region)
- Before You Start
- API Overview
- Calling APIs
- Getting Started
-
APIs V2 (Recommended)
- Lifecycle Management
-
Instance Management
- Resetting the Password
- Resetting Kafka Manager Password
- Configuring Automatic Topic Creation
- Modifying the Private IP Address for Cross-VPC Access
- Querying Kafka Cluster Metadata
- Querying Consumer Group Details
- Resetting Consumer Group Offset to the Specified Position
- Querying Coordinator Details of a Kafka Instance
- Adding Partitions to a Topic for a Kafka Instance
- Reassigning Replicas of a Topic for a Kafka Instance
- Querying the Disk Usage Status of Topics
- Querying All Consumer Groups
- Querying a Specific Consumer Group
- Deleting a Consumer Group from a Kafka Instance
- Batch Deleting Consumer Groups of a Kafka Instance
- Initiating Partition Reassigning for a Kafka Instance
- Specification Modification Management
- Topic Management
- User Management
- Message Query
- Background Task Management
- Tag Management
- Other APIs
- Permissions and Supported Actions
- Out-of-Date APIs
- Appendix
- Change History
- Developer Guide (Paris Region)
-
User Guide (Kuala Lumpur Region)
- Service Overview
- Getting Started
- Process of Using Kafka
- Permissions Management
- Buying a Kafka Instance
- Configuring Topics
- Connecting to an Instance
- Managing Messages
- Managing Consumer Groups
- Managing Quotas
-
Managing Instances
- Viewing and Modifying Basic Information of a Kafka Instance
- Viewing Kafka Disk Usage
- Viewing Kafka Background Tasks
- Viewing Sample Code of Kafka Production and Consumption
- Modifying Kafka Instance Configuration Parameters
- Configuring Kafka Instance Tags
- Exporting the Kafka Instance List
- Restarting a Kafka Instance
- Deleting Kafka Instances
- Using Kafka Manager
- Modifying Kafka Instance Specifications
- Migrating Data
- Applying for Increasing Kafka Quotas
- Monitoring and Alarms
- Viewing Kafka Audit Logs
-
FAQs
-
Instances
- Why Can't I Select Two AZs?
- Why Can't I View the Subnet and Security Group Information When Creating a DMS Instance?
- How Do I Select Storage Space for a Kafka Instance?
- How Do I Choose Between High I/O and Ultra-high I/O?
- Which Capacity Threshold Policy Should I Use?
- Which Kafka Versions Are Supported?
- What Is the ZooKeeper Address of a Kafka Instance?
- Are Kafka Instances in Cluster Mode?
- Can I Modify the Port for Accessing a Kafka Instance?
- How Long Are Kafka SSL Certificates Valid for?
- How Do I Synchronize Data from One Kafka Instance to Another?
- How Do I Change the SASL_SSL Setting of a Kafka Instance?
- How Do I Modify the SASL Mechanism?
- Will a Kafka Instance Be Restarted After Its Enterprise Project Is Modified?
- Are Kafka Brokers and ZooKeeper Deployed on the Same VM or on Different VMs?
- Which Cipher Suites Are Supported by Kafka?
- Can I Change an Instance from Single-AZ Deployment to Multi-AZ Deployment?
- Does DMS for Kafka Support Cross-AZ Disaster Recovery? Where Can I View the AZs Configured for an Existing Instance?
- Do Kafka Instances Support Disk Encryption?
- Can I Change the VPC and Subnet After a Kafka Instance Is Created?
- Where Can I Find Kafka Streams Use Cases?
- Can I Upgrade Kafka Instances?
- Why Is the Version on the Console Different from That in Kafka Manager?
- Specification Modification
-
Connections
- How Do I Select and Configure a Security Group?
- Can I Access a Kafka Instance Over a Public Network?
- How Many Connection Addresses Does a Kafka Instance Have by Default?
- Do Kafka Instances Support Cross-Region Access?
- Do Kafka Instances Support Cross-VPC Access?
- Do Kafka Instances Support Cross-Subnet Access?
- Does DMS for Kafka Support Authentication with Kerberos?
- Does DMS for Kafka Support Password-Free Access?
- Does DMS for Kafka Support Authentication on Clients by the Server?
- Can I Use PEM SSL Truststore When Connecting to a Kafka Instance with SASL_SSL Enabled?
- What Are the Differences Between JKS and CRT Certificates?
- Which TLS Version Does DMS for Kafka Support?
- Is There a Limit on the Number of Client Connections to a Kafka Instance?
- How Many Connections Are Allowed from Each IP Address?
- Can I Change the Private Network Addresses of a Kafka Instance?
- Is the Same SSL Certificate Used for Different Instances?
- Why Is It Not Recommended to Use a Sarama Client for Messaging?
-
Topics and Partitions
- Is There a Limit on the Number of Topics in a Kafka Instance?
- Why Is Partition Quantity Limited?
- Can I Reduce the Partition Quantity?
- Why Do I Fail to Create Topics?
- Do Kafka Instances Support Batch Importing Topics or Automatic Topic Creation?
- Why Do Deleted Topics Still Exist?
- Can I View the Disk Space Used by a Topic?
- Can I Add ACL Permissions for Topics?
- What Should I Do If Kafka Storage Space Is Used Up Because Retrieved Messages Are Not Deleted?
- How Do I Increase the Partition Quantity?
- Will a Kafka Instance Be Restarted After Its Automatic Topic Creation Setting Is Modified?
- Can I Delete Unnecessary Topics in a Consumer Group?
- What Can I Do If a Consumer Fails to Retrieve Messages from a Topic Due to Insufficient Permissions?
- Why Does an Instance Contain Default Topics __trace and __consumer_offsets?
- Consumer Groups
-
Messages
- What Is the Maximum Size of a Message that Can be Created?
- Why Does Message Poll Often Fail During Rebalancing?
- Why Can't I Query Messages on the Console?
- What Can I Do If Kafka Messages Are Accumulated?
- Why Do Messages Still Exist After the Retention Period Elapses?
- Do Kafka Instances Support Delayed Message Delivery?
- How Do I View the Number of Accumulated Messages?
- Why Is the Message Creation Time Displayed as Year 1970?
-
Kafka Manager
- Can I Configure a Kafka Manager Account to Be Read-Only?
- Why Can't I See Broker Information After Logging In to Kafka Manager?
- Yikes! Insufficient partition balance when creating topic : projectman_project_enterprise_project Try again.
- Can I Query the Body of a Message by Using Kafka Manager?
- Can I Change the Port of the Kafka Manager Web UI?
- Which Topic Configurations Can Be Modified on Kafka Manager?
- Why Is Information Displayed on Kafka Manager Inconsistent with Cloud Eye Monitoring Data?
- How Do I Change a Partition Leader for a Topic in Kafka Manager?
- Monitoring & Alarm
-
Instances
-
Troubleshooting
- Troubleshooting Kafka Connection Exceptions
- Troubleshooting 6-Min Latency Between Message Creation and Retrieval
- Troubleshooting Message Creation Failures
- Troubleshooting Topic Deletion Failures
- Troubleshooting Failure to Log In to Kafka Manager in Windows
- Troubleshooting Error "Topic {{topic_name}} not present in metadata after 60000 ms" During Message Production or Consumption
- Change History
- API Reference (Kuala Lumpur Region)
-
User Guide (ME-Abu Dhabi Region)
- General Reference
Copied.
Kafka Data Migration Overview
You can migrate Kafka services to connect message producers and consumers to a new Kafka instance and can even migrate persisted message data to the new Kafka instance. Kafka services can be migrated in the following two scenarios:
- Migrating services to the cloud without downtime
Services that have high requirements on continuity must be smoothly migrated to the cloud because they cannot afford a long downtime.
- Re-deploying services on the cloud
A Kafka instance deployed within an AZ is not capable of cross-AZ disaster recovery. For higher reliability, you can re-deploy services to an instance that is deployed across AZs.
Constraints
- When Smart Connect is used to migrate services, it consumes the source Kafka messages and produces messages to the target Kafka instance, occupying the bandwidth of the source and the target Kafka.
- To maintain performance, Smart Connect only synchronizes the source and target data in real time. The consumption progress is synchronized in batches, so the consumption progress on the source and target partitions may vary from 0 to 100.
Preparation
- Configure the network environment.
A Kafka instance can be accessed within a VPC or over a public network. For public network access, the producer and consumer must have public access permissions, and the following security group rules must be configured.
Table 1 Security group rules Direction
Protocol
Port
Source
Description
Inbound
TCP
9094
IP address or IP address group of the Kafka client
Accessing a Kafka instance in a public network (in plaintext)
Inbound
TCP
9095
IP address or IP address group of the Kafka client
Accessing a Kafka instance in a public network (in ciphertext)
- Create the target Kafka instance.
The specifications of the target instance cannot be lower than the original specifications. For more information, see Buying a Kafka Instance.
- Create a topic in the target Kafka instance.
Create a topic with the same configurations as the original Kafka instance, including the topic name, number of replicas, number of partitions, message aging time, and whether to enable synchronous replication and flushing. For more information, see Creating a Kafka Topic.
Migration Scheme 1: Migrating the Production First
Migrate the message production service to the new Kafka instance. After migration, the original Kafka instance will no longer produce messages. After all messages of the original Kafka instance are consumed, migrate the message consumption service to the new Kafka instance to consume messages of this instance.
This is a common migration scheme. It is simple and easy to control on the service side. During the migration, the message sequence is ensured, so this scheme is suitable for scenarios with strict requirements on the message sequence. However, latency may occur because there is a period when you have to wait for all data to be consumed.
- Change the Kafka connection address of the producer to that of the new Kafka instance.
- Restart the production service so that the producer can send new messages to the new Kafka instance.
- Check the consumption progress of each consumer group in the original Kafka instance until all data in the original Kafka instance is consumed.
- Change the Kafka connection addresses of the consumers to those of the new Kafka instance.
- Restart the consumption service so that consumers can consume messages from the new Kafka instance.
- Check whether consumers consume messages properly from the new Kafka instance.
- The migration is complete.
Migration Scheme 2: Migrating the Production Later
Use multiple consumers for the consumption service. Some consume messages from the original Kafka instance, and others consume messages from the new Kafka instances. Then, migrate the production service to the new Kafka instance so that all messages can be consumed in time.
For a certain period of time, the consumption service consumes messages from both the original and new Kafka instances. Before the migration, message consumption from the new Kafka instance has already started, so there is no latency. However, early on in the migration, data is consumed from both the original and new Kafka instances, so the messages may not be consumed in the order that they are produced. This scheme is suitable for services that require low latency but do not require strict message sequence.
- Start new consumer clients, set the Kafka connection addresses to that of the new Kafka instance, and consume data from the new Kafka instance.
NOTE:
Original consumer clients must continue running. Messages are consumed from both the original and new Kafka instances.
- Change the Kafka connection address of the producer to that of the new Kafka instance.
- Restart the producer client to migrate the production service to the new Kafka instance.
- After the production service is migrated, check whether the consumption service connected to the new Kafka instance is normal.
- After all data in the original Kafka is consumed, close the original consumption clients.
- The migration is complete.
Migration Scheme 3: Migrating the Consumption First
Use Smart Connect to synchronize the two Kafka instances, migrate the consumer first and then the producer to the new Kafka instance.
This scheme uses Smart Connect to synchronize the source and target data in real time. However, the consumption progress is synchronized in batches. The consumption progress on the source and target partition may vary from 0 to 100. As a result, some messages are repeatedly consumed. This scheme applies to services where the message production must continue, end-to-end latency must be low, and repeated consumption can be tolerated.
- Create a Smart Connect task for Kafka data replication. For details, see Replicating Kafka Instance Data.
- On the Message Query page of the Kafka console, check whether the latest messages and the synchronization progress of both Kafka instances are consistent. For details, see Viewing Kafka Messages.
- Change the Kafka connection addresses of the consumers to those of the new Kafka instance.
- Restart the consumption service so that consumers can consume messages from the new Kafka instance.
- Check whether consumers consume messages properly from the new Kafka instance.
- Change the Kafka connection address of the producer to that of the new Kafka instance.
- Restart the producer client to migrate the production service to the new Kafka instance.
- After the production service is migrated, check whether the consumption service connected to the new Kafka instance is normal.
- The migration is complete.
How Do I Migrate Persisted Data Along with Services?
You can migrate consumed data from the original instance to a new instance by using Smart Connect. This tool mirrors the original Kafka producer and consumer into new ones and migrates data to the new Kafka instance. For details, see Replicating Kafka Instance Data.
Note that each cloud Kafka instance stores data in three replicas. Therefore, the storage space of the new instance should be three times that of the original single-replica message storage.
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